Stainless steels are sometimes referred to as high-alloy steels. These steels exhibit superior corrosion resistance in comparison to other steels due to their higher chromium content. Stainless steels are classified into three groups according to their crystalline structure. These are the martensitic, austenitic, and ferritic groups.
| Element | Content (%) |
|---|---|
| Iron, Fe | 76 |
| Chromium, Cr | 12.25-13.25 |
| Nickel, Ni | 7.50-8.50 |
| Molybdenum, Mo | 2.0-2.50 |
| Aluminum, Al | 0.90-1.35 |
| Manganese, Mn | 0.10 |
| Silicon, Si | 0.10 |
| Carbon, C | 0.050 |
| Nitrogen, N | 0.010 |
| Phosphorous, P | 0.010 |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.80 g/cm3 | 0.282 lb/in³ |
| Properties | Metric | Imperia |
|---|---|---|
| Tensile strength | 1620 MPa | 235000 psi |
| Yield strength (@strain 0.200%) | 1480 MPa | 215000 psi |
| Elastic modulus | 203 GPa | 29443 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (In 50 mm) | 12.00% | 12.00% |
| Charpy Impact | 27.0 J | 19.9 ft-lb |
| Machinability (35-40 average, based on 100 machinability for AISI 1212 steel) | 35.0-40.0 | 35.0-40.0 |
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